NTN QJ 321 bearing

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NTN QJ 321 Bearing Details:
Bearing NameQJ 321
New ModelQJ321
Old Model176321 bearing
product ModelQJ321
CategoryAngular Contact Ball Bearings
BrandNTN Bearing
Inner Diameter d ( mm ) 105
Outer Diameter D ( mm )225
Thickness B ( mm )49
NTN QJ 321 Bearing   Bearing Size and Drawing:
QJ 321
NTN QJ 321 Bearing With size alternative model
ModelInner Diameter
d(mm)
Outer Diameter
D(mm)
thickness
B(mm)
BrandType
MAC N321 Bearing10522549MACCylindrical Roller Bearings
NTN 7321AC Bearing10522549NTNAngular Contact Ball Bearings
NTN NJ 2326 E +HJ 2327 E Bearing10522549NTNCylindrical Roller Bearings
TBS 6321-2Z Bearing10522549TBSDeep Groove Ball Bearings
NSK QJ 321 Bearing10522549NSKAngular Contact Ball Bearings
NACHI 6321-2Z Bearing10522549NACHIDeep Groove Ball Bearings
ZKL 7321 B Bearing10522549ZKLAngular Contact Ball Bearings
NACHI 30321 Bearing10522549NACHITapered Roller Bearings
NTN 6321 Bearing10522549NTNDeep Groove Ball Bearings
STEYR NU 321 Bearing10522549STEYRCylindrical Roller Bearings

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What are the structural components and design advantages of angular contact ball bearings?
 
Angular contact ball bearings consist of an inner ring, outer ring, steel balls, and a cage. The raceways of the raceways are designed with a contact angle (typically 15°, 25°, or 40°) between the bearing rings and the steel balls. They offer advantages such as the ability to simultaneously withstand radial and unidirectional axial loads, high limiting speed, high precision, good rigidity, and the ability to withstand bidirectional axial loads when installed in pairs.
 
What are the advantages of angular contact ball bearings compared to other similar bearings?
 
Compared to deep groove ball bearings, angular contact ball bearings have a higher axial load capacity and higher rigidity, making them suitable for precision positioning applications. Compared to tapered roller bearings, they have a higher limiting speed and lower friction, making them more suitable for high-speed operation. Compared to thrust ball bearings, they can simultaneously withstand combined radial and axial loads, and when used in pairs, they maintain high rigidity under bidirectional axial loads without the need for additional radial bearings.
 
What are the applicable applications and typical uses of angular contact ball bearings?
 
These bearings are suitable for high-speed, high-rigidity mechanical applications requiring precise positioning and subjected to combined loads. Typical applications include machine tool spindles, automobile wheel hubs, centrifugal pumps, high-speed electric spindles, industrial robot joints, aero-engine spindles, and precision instrument turntables.

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